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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Reactive cavity optical force on microdisk-coupled nanomechanical beam waveguides.

Mo Li1, Wolfram H P Pernice, Hong X Tang

  • 1Department of Electrical Engineering, Yale University, 15 Prospect Street, New Haven Connecticut 06520, USA.

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|April 7, 2010
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Researchers show spectrally tuned optical forces in a cavity optomechanics system. A vibrating nanomechanical beam waveguide creates both dispersive and reactive optical forces, opening new research avenues.

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Area of Science:

  • Optomechanics
  • Nanophotonics
  • Quantum Optics

Background:

  • Cavity optomechanics systems couple light and mechanical motion.
  • Optical forces are crucial for manipulating mechanical elements.
  • Understanding dissipation channels is key to controlling system dynamics.

Purpose of the Study:

  • To demonstrate spectrally tuned dispersive and reactive optical forces.
  • To investigate the role of a nanomechanical beam waveguide as a dissipation channel.
  • To explore the asymmetric behavior of cavity-enhanced forces.

Main Methods:

  • Utilizing a cavity optomechanics system with a microdisk and a vibrating nanomechanical beam waveguide.
  • Coupling the waveguide to the microdisk to modulate the cavity's damping rate.
  • Analyzing the resulting dispersive and reactive optical forces.

Main Results:

  • Demonstrated spectrally tuned dispersive and reactive optical forces.
  • Observed that the reactive optical force arises due to modulation of the cavity's damping rate.
  • Found that the cavity-enhanced force is asymmetric, with a maximum at a red-detuned offset, and absent at zero detuning.

Conclusions:

  • The study successfully demonstrates novel spectrally tuned optical forces in a cavity optomechanics system.
  • The findings highlight the significance of reactive cavity backaction force.
  • This work opens new avenues for research and applications in cavity optomechanics.